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For Gemini in your terminal. Gemini’s web app does not currently document a way to add a custom MCP server.
1

Add Trillion

In Terminal, add Trillion as a remote MCP server. Gemini opens a browser when it needs you to sign in.
2

Sign in and check the connection

Tap your Trillion passkey in the browser. Then check that Gemini lists Trillion.
When it worked: Trillion appears in the list of connected MCP servers.If not: in a Gemini CLI session, type /mcp list to inspect the connection, or /mcp auth trillion to sign in again.
Last modified on October 1, 2026